1 /* TUI display source window. 2 3 Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2007, 2008, 2009 4 Free Software Foundation, Inc. 5 6 Contributed by Hewlett-Packard Company. 7 8 This file is part of GDB. 9 10 This program is free software; you can redistribute it and/or modify 11 it under the terms of the GNU General Public License as published by 12 the Free Software Foundation; either version 3 of the License, or 13 (at your option) any later version. 14 15 This program is distributed in the hope that it will be useful, 16 but WITHOUT ANY WARRANTY; without even the implied warranty of 17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 GNU General Public License for more details. 19 20 You should have received a copy of the GNU General Public License 21 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 22 23 #include "defs.h" 24 #include <ctype.h> 25 #include "symtab.h" 26 #include "frame.h" 27 #include "breakpoint.h" 28 #include "source.h" 29 #include "symtab.h" 30 #include "objfiles.h" 31 32 #include "tui/tui.h" 33 #include "tui/tui-data.h" 34 #include "tui/tui-stack.h" 35 #include "tui/tui-winsource.h" 36 #include "tui/tui-source.h" 37 38 #include "gdb_string.h" 39 #include "gdb_curses.h" 40 41 /* Function to display source in the source window. */ 42 enum tui_status 43 tui_set_source_content (struct symtab *s, 44 int line_no, 45 int noerror) 46 { 47 enum tui_status ret = TUI_FAILURE; 48 49 if (s != (struct symtab *) NULL && s->filename != (char *) NULL) 50 { 51 FILE *stream; 52 int i, desc, c, line_width, nlines; 53 char *src_line = 0; 54 55 if ((ret = tui_alloc_source_buffer (TUI_SRC_WIN)) == TUI_SUCCESS) 56 { 57 line_width = TUI_SRC_WIN->generic.width - 1; 58 /* Take hilite (window border) into account, when 59 calculating the number of lines. */ 60 nlines = (line_no + (TUI_SRC_WIN->generic.height - 2)) - line_no; 61 desc = open_source_file (s); 62 if (desc < 0) 63 { 64 if (!noerror) 65 { 66 char *name = alloca (strlen (s->filename) + 100); 67 sprintf (name, "%s:%d", s->filename, line_no); 68 print_sys_errmsg (name, errno); 69 } 70 ret = TUI_FAILURE; 71 } 72 else 73 { 74 if (s->line_charpos == 0) 75 find_source_lines (s, desc); 76 77 if (line_no < 1 || line_no > s->nlines) 78 { 79 close (desc); 80 printf_unfiltered ( 81 "Line number %d out of range; %s has %d lines.\n", 82 line_no, s->filename, s->nlines); 83 } 84 else if (lseek (desc, s->line_charpos[line_no - 1], 0) < 0) 85 { 86 close (desc); 87 perror_with_name (s->filename); 88 } 89 else 90 { 91 int offset, cur_line_no, cur_line, cur_len, threshold; 92 struct tui_gen_win_info *locator = tui_locator_win_info_ptr (); 93 struct tui_source_info *src = &TUI_SRC_WIN->detail.source_info; 94 95 if (TUI_SRC_WIN->generic.title) 96 xfree (TUI_SRC_WIN->generic.title); 97 TUI_SRC_WIN->generic.title = xstrdup (s->filename); 98 99 if (src->filename) 100 xfree (src->filename); 101 src->filename = xstrdup (s->filename); 102 103 /* Determine the threshold for the length of the 104 line and the offset to start the display. */ 105 offset = src->horizontal_offset; 106 threshold = (line_width - 1) + offset; 107 stream = fdopen (desc, FOPEN_RT); 108 clearerr (stream); 109 cur_line = 0; 110 src->gdbarch = get_objfile_arch (s->objfile); 111 src->start_line_or_addr.loa = LOA_LINE; 112 cur_line_no = src->start_line_or_addr.u.line_no = line_no; 113 if (offset > 0) 114 src_line = (char *) xmalloc ( 115 (threshold + 1) * sizeof (char)); 116 while (cur_line < nlines) 117 { 118 struct tui_win_element *element = (struct tui_win_element *) 119 TUI_SRC_WIN->generic.content[cur_line]; 120 121 /* Get the first character in the line. */ 122 c = fgetc (stream); 123 124 if (offset == 0) 125 src_line = ((struct tui_win_element *) 126 TUI_SRC_WIN->generic.content[ 127 cur_line])->which_element.source.line; 128 /* Init the line with the line number. */ 129 sprintf (src_line, "%-6d", cur_line_no); 130 cur_len = strlen (src_line); 131 i = cur_len - 132 ((cur_len / tui_default_tab_len ()) * tui_default_tab_len ()); 133 while (i < tui_default_tab_len ()) 134 { 135 src_line[cur_len] = ' '; 136 i++; 137 cur_len++; 138 } 139 src_line[cur_len] = (char) 0; 140 141 /* Set whether element is the execution point 142 and whether there is a break point on it. */ 143 element->which_element.source.line_or_addr.loa = 144 LOA_LINE; 145 element->which_element.source.line_or_addr.u.line_no = 146 cur_line_no; 147 element->which_element.source.is_exec_point = 148 (strcmp (((struct tui_win_element *) 149 locator->content[0])->which_element.locator.file_name, 150 s->filename) == 0 151 && cur_line_no == ((struct tui_win_element *) 152 locator->content[0])->which_element.locator.line_no); 153 if (c != EOF) 154 { 155 i = strlen (src_line) - 1; 156 do 157 { 158 if ((c != '\n') && (c != '\r') 159 && (++i < threshold)) 160 { 161 if (c < 040 && c != '\t') 162 { 163 src_line[i++] = '^'; 164 src_line[i] = c + 0100; 165 } 166 else if (c == 0177) 167 { 168 src_line[i++] = '^'; 169 src_line[i] = '?'; 170 } 171 else 172 { /* Store the charcter in the 173 line buffer. If it is a tab, 174 then translate to the correct 175 number of chars so we don't 176 overwrite our buffer. */ 177 if (c == '\t') 178 { 179 int j, max_tab_len = tui_default_tab_len (); 180 181 for (j = i - ((i / max_tab_len) * max_tab_len); 182 j < max_tab_len 183 && i < threshold; 184 i++, j++) 185 src_line[i] = ' '; 186 i--; 187 } 188 else 189 src_line[i] = c; 190 } 191 src_line[i + 1] = 0; 192 } 193 else 194 { /* If we have not reached EOL, then 195 eat chars until we do. */ 196 while (c != EOF && c != '\n' && c != '\r') 197 c = fgetc (stream); 198 /* Handle non-'\n' end-of-line. */ 199 if (c == '\r' 200 && (c = fgetc (stream)) != '\n' 201 && c != EOF) 202 { 203 ungetc (c, stream); 204 c = '\r'; 205 } 206 207 } 208 } 209 while (c != EOF && c != '\n' && c != '\r' 210 && i < threshold 211 && (c = fgetc (stream))); 212 } 213 /* Now copy the line taking the offset into 214 account. */ 215 if (strlen (src_line) > offset) 216 strcpy (((struct tui_win_element *) TUI_SRC_WIN->generic.content[ 217 cur_line])->which_element.source.line, 218 &src_line[offset]); 219 else 220 ((struct tui_win_element *) 221 TUI_SRC_WIN->generic.content[ 222 cur_line])->which_element.source.line[0] = (char) 0; 223 cur_line++; 224 cur_line_no++; 225 } 226 if (offset > 0) 227 xfree (src_line); 228 fclose (stream); 229 TUI_SRC_WIN->generic.content_size = nlines; 230 ret = TUI_SUCCESS; 231 } 232 } 233 } 234 } 235 return ret; 236 } 237 238 239 /* elz: This function sets the contents of the source window to empty 240 except for a line in the middle with a warning message about the 241 source not being available. This function is called by 242 tui_erase_source_contents(), which in turn is invoked when the 243 source files cannot be accessed. */ 244 245 void 246 tui_set_source_content_nil (struct tui_win_info *win_info, 247 char *warning_string) 248 { 249 int line_width; 250 int n_lines; 251 int curr_line = 0; 252 253 line_width = win_info->generic.width - 1; 254 n_lines = win_info->generic.height - 2; 255 256 /* Set to empty each line in the window, except for the one which 257 contains the message. */ 258 while (curr_line < win_info->generic.content_size) 259 { 260 /* Set the information related to each displayed line to null: 261 i.e. the line number is 0, there is no bp, it is not where 262 the program is stopped. */ 263 264 struct tui_win_element *element = 265 (struct tui_win_element *) win_info->generic.content[curr_line]; 266 element->which_element.source.line_or_addr.loa = LOA_LINE; 267 element->which_element.source.line_or_addr.u.line_no = 0; 268 element->which_element.source.is_exec_point = FALSE; 269 element->which_element.source.has_break = FALSE; 270 271 /* Set the contents of the line to blank. */ 272 element->which_element.source.line[0] = (char) 0; 273 274 /* If the current line is in the middle of the screen, then we 275 want to display the 'no source available' message in it. 276 Note: the 'weird' arithmetic with the line width and height 277 comes from the function tui_erase_source_content(). We need 278 to keep the screen and the window's actual contents in 279 synch. */ 280 281 if (curr_line == (n_lines / 2 + 1)) 282 { 283 int i; 284 int xpos; 285 int warning_length = strlen (warning_string); 286 char *src_line; 287 288 src_line = element->which_element.source.line; 289 290 if (warning_length >= ((line_width - 1) / 2)) 291 xpos = 1; 292 else 293 xpos = (line_width - 1) / 2 - warning_length; 294 295 for (i = 0; i < xpos; i++) 296 src_line[i] = ' '; 297 298 sprintf (src_line + i, "%s", warning_string); 299 300 for (i = xpos + warning_length; i < line_width; i++) 301 src_line[i] = ' '; 302 303 src_line[i] = '\n'; 304 305 } /* end if */ 306 307 curr_line++; 308 309 } /* end while */ 310 } 311 312 313 /* Function to display source in the source window. This function 314 initializes the horizontal scroll to 0. */ 315 void 316 tui_show_symtab_source (struct gdbarch *gdbarch, struct symtab *s, 317 struct tui_line_or_address line, 318 int noerror) 319 { 320 TUI_SRC_WIN->detail.source_info.horizontal_offset = 0; 321 tui_update_source_window_as_is (TUI_SRC_WIN, gdbarch, s, line, noerror); 322 } 323 324 325 /* Answer whether the source is currently displayed in the source 326 window. */ 327 int 328 tui_source_is_displayed (char *fname) 329 { 330 return (TUI_SRC_WIN->generic.content_in_use 331 && (strcmp (((struct tui_win_element *) (tui_locator_win_info_ptr ())-> 332 content[0])->which_element.locator.file_name, fname) == 0)); 333 } 334 335 336 /* Scroll the source forward or backward vertically. */ 337 void 338 tui_vertical_source_scroll (enum tui_scroll_direction scroll_direction, 339 int num_to_scroll) 340 { 341 if (TUI_SRC_WIN->generic.content != NULL) 342 { 343 struct tui_line_or_address l; 344 struct symtab *s; 345 tui_win_content content = (tui_win_content) TUI_SRC_WIN->generic.content; 346 struct symtab_and_line cursal = get_current_source_symtab_and_line (); 347 348 if (cursal.symtab == (struct symtab *) NULL) 349 s = find_pc_symtab (get_frame_pc (get_selected_frame (NULL))); 350 else 351 s = cursal.symtab; 352 353 l.loa = LOA_LINE; 354 if (scroll_direction == FORWARD_SCROLL) 355 { 356 l.u.line_no = content[0]->which_element.source.line_or_addr.u.line_no 357 + num_to_scroll; 358 if (l.u.line_no > s->nlines) 359 /* line = s->nlines - win_info->generic.content_size + 1; */ 360 /* elz: fix for dts 23398. */ 361 l.u.line_no = content[0]->which_element.source.line_or_addr.u.line_no; 362 } 363 else 364 { 365 l.u.line_no = content[0]->which_element.source.line_or_addr.u.line_no 366 - num_to_scroll; 367 if (l.u.line_no <= 0) 368 l.u.line_no = 1; 369 } 370 371 print_source_lines (s, l.u.line_no, l.u.line_no + 1, 0); 372 } 373 } 374